Poor sound with audio interface

Oct 13, 2010
Reaction score
When I plug my iPhone 5s into my Golf 7 audio-interface, the sound quality is very poor. Specifically, the base frequencies are gone. When playing via bluetooth, no problem, I get a full sound. Of course, with BT, I get limited access via the touch screen and the power is drained from the phone. I have tried other phones on my car and found the same problem, hence not the phone.
Has anyone encountered this problem and found a solution?

Shop Amazon

Shop for your Apple, Mac, iPhone and other computer products on Amazon.
We are a participant in the Amazon Services LLC Associates Program, an affiliate program designed to provide a means for us to earn fees by linking to Amazon and affiliated sites.